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If your radiator is completely full of coolant (check first), then on the passenger side there is a white box with a black cap that sits right behind the battery. That is your coolant reservoir. Any additional coolant would be filled into that reservoir. Also you should know what coolant your vehicle has running in it. GM uses their own special coolant known as DEXCOOL which is a long life coolant. Mixing DEXCOOL with any other coolant reduces it's life and cooling effeciency. So be sure to match what coolant you already have and you'll be alright.

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16y ago

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